Government forms should have as few questions as possible. Every additional question you ask puts a burden on the user.
If you don’t absolutely need the question – get rid of it. If you are asking the question because you might need the information later, then add the question later.
Start with questions that will let users know if they are not eligible for the service, so that you don’t waste people’s time.
As well as that – every piece of information you collect must be stored, processed and comply with data protection laws and guidelines.
You should only include a question on a form when you know: